Maddie James
Lye is a crucial ingredient in candle and soap-making. It is sold in the form of sodium hydroxide microbeads, flakes, or powder, and its purity is an important consideration for manufacturers and crafters alike. While 100% pure lye may not be attainable, it is stressed that the lye used should not be mixed with additional chemicals like metals and peroxides. The general consensus is that a purity level above 90% is sufficient for soap-making, with some sources recommending 95% or higher. The storage conditions of lye are also critical, as exposure to air, humidity, water vapour, and carbon dioxide can cause degradation over time.
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What You'll Learn
Lye purity is important to ensure no additional chemicals are present
Lye is a hazardous material that requires careful handling and is an essential ingredient in candle-making. The purity of lye is important to ensure no additional chemicals are present. Lye, also known as sodium hydroxide, is often sold in bead or flake form, with its purity stated as a percentage. While it is impossible to achieve 100% purity, it is important to strive for high purity to avoid impurities that can affect the final product.
The presence of additional chemicals in low-purity lye can impact the performance and quality of the candles. For example, some low-quality lye may contain metals or peroxides, which can alter the chemical reactions and affect the burning properties of the candles. Therefore, it is crucial to use lye with high purity to minimise the risk of introducing unwanted substances into the candle-making process.
The recommended purity level for lye in candle-making is generally above 90%. Many suppliers offer lye with 95% to 99% purity, which is suitable for candle-making. However, it is important to note that even with proper storage, the purity of lye can decrease over time due to exposure to air, humidity, and carbon dioxide. Therefore, it is essential to store lye in a tightly closed container to minimise degradation and maintain its purity for as long as possible.
To ensure the desired purity, it is advisable to purchase lye from reputable suppliers who provide detailed information about the product's purity and handling instructions. By using high-purity lye and practising proper storage methods, candle makers can minimise the presence of additional chemicals and maintain the quality and performance of their candles.
In summary, the purity of lye is important in candle-making to ensure that no unwanted chemicals are introduced into the process. By using high-purity lye, candle makers can create consistent and high-quality candles with the desired burning properties. Proper storage and handling of lye are also crucial to maintaining its purity over time.
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Degradation of lye is caused by exposure to air and humidity
Lye is a common ingredient in candles and soaps. It is also used in household cleaning products. Lye is a highly reactive substance and requires careful handling. It is corrosive and can cause chemical burns, permanent injuries, and scarring.
Lye is deliquescent and has a strong affinity for moisture in the air. Exposure to air and humidity causes degradation of lye. When lye is exposed to open air, it absorbs large amounts of atmospheric moisture. This is why lye is stored in airtight containers. Glass is not suitable for storing lye as it is corrosive to it.
The degradation of lye due to exposure to air and humidity can be explained by its chemical properties. Lye, also known as sodium hydroxide, has the chemical formula NaOH. When NaOH is exposed to air, it reacts with carbon dioxide (CO2) to form sodium carbonate, also known as washing soda or soda ash. This reaction can be represented as follows:
> 2 NaOH + CO2 → Na2CO3 + H2O
The sodium carbonate formed is the white scum sometimes observed on top of the lye solution. Over time, all NaOH exposed to open air will eventually convert to washing soda.
In addition to reacting with carbon dioxide, NaOH also absorbs water vapor from the air. This water absorption and dilution continue until the solution reaches equilibrium with the humidity in the air or until all of the NaOH has reacted to form sodium carbonate. The relative humidity and the initial concentration of the NaOH solution determine the final concentration of the solution after exposure to air.
The degradation of lye due to exposure to air and humidity is an important consideration during storage and handling. Proper storage and safety precautions are crucial when working with lye to ensure its effectiveness and prevent accidents.
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Lye should be stored at low humidity to maintain purity
Lye is a highly reactive and dangerous chemical and requires careful handling and storage. It is important to maintain the purity of lye as it is used in candle-making and soap-making processes. While it is nearly impossible to find 100% pure lye, it is important to use lye that is not mixed with additional chemicals like metals. Anything above 90% purity works for soaps and candle-making, and you can commonly find lye with 95% or 99% purity.
Lye should be stored in a sturdy, thick-walled container with a secure lid to reduce the chance of leaks or spills. The container must be made from a material that is chemically resistant to alkali, such as certain types of plastics (HDPE and PP). It is important to avoid using glass or metal containers as severe alkalis can be mildly corrosive to glass, and metals like iron and steel can cause rancidity in soap and fats.
To maintain the purity of lye, it is crucial to store it at very low humidity. Lye has a strong affinity for moisture in the air and will dissolve when exposed to open air, absorbing large amounts of atmospheric moisture. This can reduce the purity of the lye and affect its performance in soap and candle-making. Therefore, it is recommended to store lye in air-tight and moisture-tight containers to prevent exposure to moisture and maintain its purity.
Additionally, proper storage of lye includes keeping it away from children, pets, heat, and moisture. Lye is a hazardous material and can cause chemical burns, permanent injuries, and other health risks if not handled and stored properly. It is important to always review the provided safety guidelines and take necessary precautions when working with lye.
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Lye purity impacts the superfatting process in soapmaking
Lye is a critical ingredient in soapmaking, and its purity can impact the final product's quality and characteristics. While it is impossible to achieve 100% purity with any chemical, the general consensus is that a minimum purity of 90% is acceptable for soapmaking. Lye purity impacts the superfatting process in soapmaking, which is a technique used to ensure the final product is not harsh or dangerous due to excess alkali.
The superfatting process involves adding more fats and oils than can be saponified by the available alkali or, conversely, adding less alkali than is required to saponify the available fats and oils. This process is also known as lye discounting, and it addresses the uncertainty in the SAP (Soapmaking Alkali Product) value. By superfatting, soapmakers can ensure that the final product is not excessively alkaline, which can cause skin irritation or other adverse effects.
The purity of lye is important in the superfatting process because impurities can affect the accuracy of the SAP value calculations. If the lye contains impurities, the actual amount of active lye available for saponification may be lower than expected, resulting in an incorrect calculation of the fats and oils needed. This can lead to inconsistencies in the final product, such as bars with varying amounts of oil or lye.
Additionally, certain impurities in the lye can have specific effects on the superfatting process and the final soap product. For example, carbonates can add detergency or cleaning power to the soap, while iron may trigger DOS (rancidity). Therefore, it is crucial for soapmakers to be aware of the purity of their lye and the types of impurities present to make the necessary adjustments during the superfatting process.
While food-grade lye is not necessary for soapmaking, some soapmakers prefer to use it as it has been tested for additional trace impurities. However, others argue that the type of lye used is irrelevant as long as the purity is within the acceptable range, and the proper calculations are made during the superfatting process. Ultimately, the key to successful soapmaking is consistency and accuracy in measurements and calculations, rather than the highest possible purity of lye.
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Lye is a hazardous material and must be handled carefully
Lye is a hazardous substance and must be handled with extreme caution. It is caustic and can cause severe burns if it comes into contact with the skin or eyes. When working with lye, it is important to wear protective clothing, including long sleeves, pants, rubber gloves, and goggles. It is also crucial to work in a well-ventilated area as lye can give off deadly fumes.
When mixing lye with water, it is important to use a heat-resistant container that can handle the high temperatures without melting or shattering. Plastic pitchers are a good option, while glass containers should be avoided. Always start with cool water to prevent the water from boiling and causing scalding.
It is essential to purchase lye from a reputable source and ensure that it is labelled as 100% lye or sodium hydroxide. Impure lye may contain additional chemicals or metals that can be dangerous. However, it is important to note that no chemical is ever perfectly pure, and a minimum purity of 90% is generally considered acceptable for soap-making.
Proper storage of lye is crucial to maintaining its purity and safety. Lye should be stored in a cool, dry place with low humidity to prevent the formation of carbonates. Minimizing the introduction of fresh air is also important, as carbon dioxide and water vapour can contaminate the lye. Even with proper storage, the purity of lye will decrease over time due to exposure to air when the container is opened.
While working with lye can be intimidating, following safety guidelines and using common sense can greatly reduce the risk of accidents. Many people have successfully created soap using lye, and with the proper precautions, it is possible to navigate this aspect of crafting safely and confidently.
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Frequently asked questions
Lye is the common name for sodium hydroxide, a highly caustic substance. It is important to use lye that is not mixed with additional chemicals like metals. Anything above 90% purity works for candle making.
Lye degrades over time due to exposure to air and humidity. Degradation is more about storage conditions and how well you can control exposure to water vapour and carbon dioxide in the air.
It is important to store lye at very low humidity and minimize the introduction of fresh air. Lye should be discarded if it gets clumpy.
